Logging-jack.



PATBNTED JULY 2, 1907.

J. B; GILGHRIST LOGGING JACK.

APPLIoATxoN FILED Nov. ze. ma.

NVENTOR.

ATTO/NVE Ys WJ TAI'ESSES: v z

JOHN E. GILCHRIST, OF SOUTH BEND, WASHINGTON.

LoeGING-JA'GK.

Specification of Letters Patent.

Patented July 2, 1907.

Application filed November 26,1906. Serial 110.345,15.

To all whom it may concern:

Be it known that I, JOHN E. GILormIsT, a citizen of the United States,residing at South ABend, in the county of Pacific and State ofWashington, have in-v vented a new and useful Logging-Jack, of which thefollowing is a specification.

This invention has relation to logging jacks and it consists in thenovel construction and arrangement of its parts as hereinafter shown anddescribed.

The logging jack herein shown and described is similar in many respectsto the logging jack described and shown in my prior patent, grantedMarch 17, 1896, No. 556,625, and in its general arrangement is alsosimilar .to the construction shown in the patent granted to Alcxander M.Gilchrist7 January 23, 1900, No. 641,951. My present invention, however,differs materially from those above referred to which differences Willbe hereinafter pointed out. In the aforesaid patents a transverse shaftis employed. and a pinion is journaled upon said shaft. Said pinionmeshes with the gear teeth of a lifting bar or crutch member and thesaid shaft is provided With a ratchet Wheel lwhich is operated by ahandle and Which in turn operates said crutch member through the saidpinion and shaft. In my present device I form gear teeth directly uponthe shaft and have the inner ends of the teeth located Within thecircumference of the shaft, consequently, I am enabled to have the teethlocated much closer together transversely of the shaft and thereby gaingreater leverage in the operation of the jack. In order to strengthenthe teeth I provide end Webs which connect the same together. Said Websare also integral with the shaft. Bearings are provided in the casingfor the ends ofthe sha-it and cover plates are attached to the outerside of the casing and which receive the extreme ends of the shaft.

In the accompanying drawing, Figure 1 is a vertical sectional view ofthe jack. Fig. 2 is an edge elevation of the same with parts in section,and Fig. 3 is a perspective View of the shaft, gear teeth and ratchetwheel.

The casing consists of the two side plates 1 which are separated by thefiller bar 2. The lifting bar or crutch member 3 is arranged to movevertically between the said side plates 1, 1 and is provided at its rearedge With the gear teeth 4. The mechanism for raising and 10W- ering thelifting bar may be of any suitable or desirable construction. I have,however, herein shown mechanism similar to that shown and described inthe patents previously referred to. This mechanism, in brief, consistsof an operating lever 5 upon which is mounted a paWl 6 said pawl beingcontrolled in position by means of a controlling lever 7. The ratchetWheel 8 is mounted upon a shaft 9 and the stop pawl 10 is locatedbetween the upper ends of the plate 1 and is controlled by a hand lever11 and engages the ratchet Wheel 8.

The gear teeth 12 are formed upon the shaft 9 and the inner ends of saidteeth are Within the periphery of the said shaft. The outer end of thesaid teeth are connected together by the Webs 13, 13. The ends of theshaft 9 are journaled in the perforations 14 provided in the side plates1 and the caps 15 are attached to the outer faces of the side plates 1and receive the extreme ends of the shaft 9. As the gear teeth 12, Webs13, 413

are integral with the shaft 9 a very durable structure is produced andat the same time the teeth 12 may be brought so close togethertransversely of the shaft as to afford maximum leverage for operatingthe lifting bar.

Having described my invention what I claim as new and desire to secureby Letters Patent is A jack comprising a casing having openings, inopposite sides, a lifting bar mounted for movement within the 'casingand having teeth, a shaft journaled in the opening of the casing andhaving integral teeth, the inner ends of which are Within the peripheryof the shaft and the outer ends lying beyond the periphery of the shaft,andv integral webs connecting the ends of the teeth and the shafttogether, caps applied to the exterior of the casing over the openingsthereof and having recesses forming bearings for the said shaft andretaining the same against longitudinal movement'and a ratchet Wheelmounted upon the shaft and being spaced fiom one of the webs thereof andfrom one of the sides of the casing whereby portions of the shaft areleft exposed and an operating lever adapted to yengage the said exposedportions of the shaft and carrying a pawl for engagement with theratchet Wheel.

In testimony that 1 claim the foregoing as my own, I have hereto affixedmy signature in the presence of two witnesses.

Witnesses M. D. EGBERT, H. A. HILL.

